Not a lot of attention has been paid to the Asian tiger mosquito, which is another species which we believe can also transmit Zika virus. It has a much broader range. It's found all the way north into coastal areas of Connecticut, Long Island and the New York metro area.

Not a lot of attention has been paid to the Asian tiger mosquito, which is another species which we believe can also transmit Zika virus. It has a much broader range. It's found all the way north into coastal areas of Connecticut, Long Island and the New York metro area.

I think this spring as the mosquito populations start to increase, we should be especially cautious about locations where we've had locally-transmitted Dengue virus. The same mosquito species that transmits Zika also transmits Dengue. It's confined primarily to Florida, South Florida, along the Gulf states and Southern Texas with a few small populations in Arizona and California.

I think that DDT holds a lot of promise. It hasn't been banned everywhere - obviously it has in the U.S. In fact, about 10 years ago, the WHO came out with a statement promoting it for public health interventions in many countries. It's cheap. It's very, very effective. We've never had an insecticide that has worked so well since. It's also safe. A lot of people don't realize that its toxicity profile for humans is low.